<?php
// +-----------------------------------------------------------------------------------------------
// | 简易CMS
// +-----------------------------------------------------------------------------------------------
// | [请手动修改文件描述]
// +-----------------------------------------------------------------------------------------------
// | Author: IT果农 <htmambo@163.com> <http://www.haolie.net>
// +-----------------------------------------------------------------------------------------------
// | Version $Id: Pager.class.php 24 2016-10-15 18:56:36Z IT果农 <htmambo@163.com> $
// +-----------------------------------------------------------------------------------------------

namespace CMS;

// 系统初始化
class Pager {
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage = 11; // 分页栏每页显示的页数
    public $lastSuffix   = false;
    private $p           = 'p'; //分页参数名
    private $url         = ''; //当前链接URL
    public $nowPage      = 1;
    public $clientmethod = '';
    // 分页显示定制
    private $config      = array(
        'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
        'prev'   => '<',
        'next'   => '>',
        'first'  => '|<', //'1...',
        'last'   => '>|', //'...%TOTAL_PAGE%',
        'theme'  => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',
    );

    /**
     * 架构函数
     * @param int $totalRows  总的记录数
     * @param int $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows, $listRows = 20, $parameter = array(), $nowPage = 0) {
        config('paginate.var_page') && $this->p = config('paginate.var_page'); //设置分页参数名称
        $skips   = array('thinkphp_show_page_trace', 'PHPSESSID', 'sessid', '__forward__');
        foreach ($skips as $k) {
            if (isset($parameter[$k])) {
                unset($parameter[$k]);
            }
        }
        /* 基础设置 */
        $this->totalRows = $totalRows; //设置总记录数
        $this->listRows  = $listRows;  //设置每页显示行数
        $this->parameter = empty($parameter) ? $_GET : $parameter;
        $this->nowPage = $nowPage?:(input($this->p, 0, 'intval')? : 1);
        $this->nowPage = max(1, (int)$this->nowPage);// > 0 ? $this->nowPage : 1;
        $this->firstRow  = $this->listRows * ($this->nowPage - 1);
    }

    /**
     * 定制分页链接设置
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setConfig($name, $value) {
        if (isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }

    /**
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     */
    private function url($page) {
        return str_replace(urlencode('[PAGE]'), $page, $this->url);
    }

    /**
     * 组装分页链接
     * @return string
     */
    function show() {
        if (0 == $this->totalRows) {
            return '';
        }

        /* 生成URL */
        $this->parameter[$this->p] = '[PAGE]';
        $this->url = url(ACTION_NAME, $this->parameter);
        if (IS_AJAX) {
            if($this->clientmethod){
                $pre = '';
                if($pagepara = input('pagepara')) {
                    if(is_array($pagepara)) {
                        $pre = ', ' . str_replace('"', '\'', json_encode($pagepara));
                    }
                }
                $this->url = 'javascript:'.$this->clientmethod.'('.urlencode('[PAGE]') . $pre . ');';
            } else {
                $this->url .= '#' . $this->p . '=' . urlencode('[PAGE]');
            }
        }
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
        if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }
        if ($this->totalPages < 2) {
            return '';
        }
        /* 计算分页临时变量 */
        $now_cool_page        = $this->rollPage / 2;
        $now_cool_page_ceil   = ceil($now_cool_page);
        $this->lastSuffix && $this->config['last'] = $this->totalPages;

        //上一页
        $up_row  = $this->nowPage - 1;
        $up_page = $up_row > 0 ? '<li class="previous"><a href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a></li>' : '<li class="disabled"><span>'.$this->config['prev'].'</span></li>';

        //下一页
        $down_row  = $this->nowPage + 1;
        $down_page = ($down_row <= $this->totalPages) ? '<li class="next"><a href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a></li>' : '<li class="disabled"><span>'.$this->config['next'].'</span></li>';

        //第一页
        $the_first = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
            $the_first = '<li class="first"><a href="' . $this->url(1) . '">' . $this->config['first'] . '</a></li>';
        } else {
            $the_first = '<li class="disabled"><span>' . $this->config['first'] . '</span></li>';
        }

        //最后一页
        $the_end = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
            $the_end = '<li class="end"><a href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a></li>';
        } else {
            $the_end = '<li class="disabled"><span>' . $this->config['last'] . '</span></li>';
        }

        //数字连接
        $link_page = "";
        for ($i = 1; $i <= $this->rollPage; $i++) {
            if (($this->nowPage - $now_cool_page) <= 0) {
                $page = $i;
            } elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
                $page = $this->totalPages - $this->rollPage + $i;
            } else {
                $page = $this->nowPage - $now_cool_page_ceil + $i;
            }
            if ($page > 0 && $page != $this->nowPage) {

                if ($page <= $this->totalPages) {
                    $link_page .= '<li><a class="num" href="' . $this->url($page) . '">' . $page . '</a></li>';
                } else {
                    break;
                }
            } else {
                if ($page > 0 && $this->totalPages != 1) {
                    $link_page .= '<li class="active"><a href="javascript:">' . $page . '</a></li>';
                }
            }
        }
        //替换分页内容
        $page_str = str_replace(
            array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'), array($this->config['header'], $this->nowPage, $up_page, $down_page,
            $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages), $this->config['theme']);
        return "<ul class='pager'>{$page_str}</ul>";
    }

}
